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| author | wzt.wzt@gmail.com <wzt.wzt@gmail.com> | 2010-04-02 08:41:14 +0200 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2010-04-02 08:41:14 +0200 |
| commit | a506aedc51093544ff0f9610af6066d18cb6abbe (patch) | |
| tree | 3a23d5987c02a94eb46746ae29d50d2d9e38a150 /block | |
| parent | b2b163dd47024e445410b72d0c5df6d819c14dfd (diff) | |
| download | lwn-a506aedc51093544ff0f9610af6066d18cb6abbe.tar.gz lwn-a506aedc51093544ff0f9610af6066d18cb6abbe.zip | |
Block: Fix block/elevator.c elevator_get() off-by-one error
elevator_get() not check the name length, if the name length > sizeof(elv),
elv will miss the '\0'. And elv buffer will be replace "-iosched" as something
like aaaaaaaaa, then call request_module() can load an not trust module.
Signed-off-by: Zhitong Wang <zhitong.wangzt@alibaba-inc.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'block')
| -rw-r--r-- | block/elevator.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/block/elevator.c b/block/elevator.c index df75676f6671..76e3702d5381 100644 --- a/block/elevator.c +++ b/block/elevator.c @@ -154,7 +154,7 @@ static struct elevator_type *elevator_get(const char *name) spin_unlock(&elv_list_lock); - sprintf(elv, "%s-iosched", name); + snprintf(elv, sizeof(elv), "%s-iosched", name); request_module("%s", elv); spin_lock(&elv_list_lock); |